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M2 wave buoy daily means for Apr 2018

Daily means from the M2 wave buoy for Apr 2018, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

718 wave-buoy observations covered all 30 days. Typical wave height was 3.1 ft (10th–90th percentile 1.5–6.7 ft), while mean peak wave period was 6.1 seconds (10th–90th percentile 3.8–9.3 seconds). Typical wind was 13.6 mph (10th–90th percentile 5.8–24.3 mph). 4 of 3,590 checked values (0.1%) were excluded by quality control. Across 7 comparable years, mean wave height was above the same-month mean of 3 ft and mean wave period was above the same-month mean of 5.1 seconds.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

3.1ft
Mean: 3.6 ft
P10–P90: 1.5 — 6.7 ft
Recorded extremes

1 — 14.4 ft

Mean Observed Wave Period

6.1secs
P10–P90: 3.8 — 9.3secs
Recorded extremes

2.6 — 15.2secs

Available for 714 of 718 hourly samples

Typical Observed Wind

SSE, 13.6mph
Mean: 14.5 mph
P10–P90: 5.8 — 24.3 mph
Recorded extremes

0 — 37.8 mph

Circular concentration: 31%

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 718 hourly samples

Compared With Previous Aprils

Historical baseline from 4,991 observations across 7 years.

Wave Height
3.6ft
0.6ft above mean
Historical mean 2.986ft
Wave Period
6.1s
1s above mean
Historical mean 5.1s
Water Temperature
–
Not enough comparable data
Historical mean 8.6°C

Chart showing grouped wave observations for M2. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About M2 wave buoy

M2 (WMO 62091) is part of the Irish Marine Data Buoy Observation Network, managed by the Marine Institute in collaboration with Met Éireann. Moored in the Irish Sea east of Ireland, it provides open-water context for the busy, relatively enclosed waters between the Irish and British coasts.

Its current data source reports wave height, wave period, wave direction, directional spread, wind conditions and sea temperature.

Metrics are rows; days run left to right.
M2 wave buoy daily means Apr 2018Last observation shown
Metric
Mean significant wave height (ft)3745474215342236106321243342222
Mean maximum wave height (ft)411775105327453349158431353462323
Mean peak period (s)5787661097655546788787455455554
Mean zero-crossing period (s)455545654444444565555344444434
Mean peak wave directionNEconcentration 92%ENEconcentration 87%Sconcentration 84%Variableconcentration 8%Econcentration 40%SSEconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 89%NEconcentration 93%NNEconcentration 98%NEconcentration 87%NNEconcentration 78%Sconcentration 87%SSEconcentration 84%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 99%Sconcentration 98%SSEconcentration 85%SSWconcentration 90%SSWconcentration 87%SSEconcentration 93%SWconcentration 93%SWconcentration 89%ENEconcentration 37%NNEconcentration 51%ENEconcentration 56%NEconcentration 95%
Mean wave directionENEconcentration 96%Econcentration 95%SSEconcentration 84%Variableconcentration 8%Econcentration 37%SSEconcentration 99%Sconcentration 99%Sconcentration 100%Sconcentration 98%ENEconcentration 94%NNEconcentration 99%NEconcentration 95%NEconcentration 76%Sconcentration 99%SSEconcentration 95%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%SSEconcentration 99%SSEconcentration 96%SSWconcentration 95%SSWconcentration 93%Sconcentration 99%SWconcentration 96%SWconcentration 96%Econcentration 41%NNEconcentration 73%ENEconcentration 87%NEconcentration 89%
Mean directional spread (°)28.725.227.021.327.820.417.320.326.521.328.128.433.226.130.720.618.325.423.025.926.727.926.327.132.327.534.827.028.127.5
Mean wind directionENEconcentration 95%Econcentration 71%Sconcentration 88%Nconcentration 71%Variableconcentration 25%SSEconcentration 96%Sconcentration 92%Sconcentration 79%SSEconcentration 75%ENEconcentration 93%ENEconcentration 94%ENEconcentration 96%Variableconcentration 25%SSEconcentration 82%SEconcentration 96%Sconcentration 98%Sconcentration 98%Sconcentration 97%Sconcentration 99%SSWconcentration 68%SEconcentration 81%SWconcentration 91%SWconcentration 88%WSWconcentration 69%WSWconcentration 91%WSWconcentration 91%NEconcentration 65%NNEconcentration 92%NEconcentration 89%NNEconcentration 60%
Mean wind speed (mph)161816181525106820131681315243021139614171114169111211
Mean water temperature(°C)------------------------------

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Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Met Éireann Irish Marine Data Buoy Observation Network.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

› Wave Buoy List